Sealing strip for pulp and other types of screen plates



Oct. 2, 1951 H, R I i DOWNS, JR 2,569,708

SEALING ST FOR PULP AND OTHER TYPES OF SCREEN PLATES Filed March 26,1947 5 Sheets-Sheet l A TToeA/ Y Oct. 2, 1951 4 H. WJDOWNS, JR 2,569,708

SEALING STRIP FOR PULP AND OTHER TYPES OF SCREEN PLATES Filed March 26,1947 5 Sheets-Sheet 2 LM INVN70A7 ATTO H. W. DOWNS, JR SEALING STRIP FORPULP AND OTHER Oct. 2, 1951 TYPES OF SCREEN PLATES 5 Sheets-Sheet 5Filed March 26, 1947 ,4 TTOEA/E Y I/VVIE/VTU Patented Oct. 2, 1951OFFICE SEALING STRIP FOR PULP ANDDTHER TYPES OF SCREENPLATES HenryWilliam Downs,,Jr., Lennoxville, Quebec, Canada Application March 26,1947, Serial No. 737,398

The invention relates to improvements in sealing strips for pulp andother types of screen plates as described in the present specificationand illustrated in the accompanying .drawings that form a part of thesame.

The invention consists essentially of the novel features of constructionas specifically pointed out in the claims for novelty following adescription in detail of an acceptable form of the invention.

The objects of the invention are to provide a sealing strip for screenplates which will seal the joint between the edge of a screen plate andthe wall of a vat; to devise a sealing strip which will permit easyremoval orreplacement of screen plates in a vat; to provide a sanitarymeans of securing screen plates in a vat and render same readilyaccessible for washing and cleaning; to construct a sealing stripwhichcan be tightened down securely on a screen plate, and at the sametime, be .drawn in snugly against the wall of a vat; to devise a sealingstrip which is simple in design and inexpensive to manufacture; toconstruct a sealing strip which has a positive lock ing device forholding same in position in a vat; and generally to provide a sealingstrip which will be durable and efficient for its purpose.

In the drawings:

Figure l is a perspective fragmentary view showing a portion of thesealing strip and screen plate in an assembled position.

Figure 2 is a side sectional view as taken on the line 2-2 in Figure 1.

Figure 3 is a plan sectional view as taken on the line 3-3 in Figure 1.

Figure 4 is a detail showing a plan view of the guide memberfor thelocking device.

Figure 5 is a front View of Figure 4.

Figure 6 is a side sectional viewas taken on the line 6 -6 in Figure 4.

Figure 7 is a detail showing a plan view of the adjusting bolt for thelocking device. Figure 8 is a front view of Figure 7.

Figure 9 is a detail showing a plan view of the locking head.

Figure 10 is a front view of Figure 9.

Figure 11 is a side sectional view as taken on the line I ll l in Figure9.

Figure 12 is a detail showing a plan view of the lock plate.

Figure 13 is a front view of Figure 12.

Figure 14 is a side sectional View as taken on the line M 4 in Figure12.

Like numerals of reference indicate corresponding parts in the variousfigures.

1 Claim. (01. 92-30) Referring to the drawings the sealing stripconsists of a longitudinal strip or strip member as indicated by thenumeral 20. This strip is of a predetermined width and thickness toaccommodate the locking deviceswhich are placed at intervals along theentire length of same. The strip 20 is adapted to be secured to the sidewall of the vat asindicated by thenumeral 2|. The support frame orshoulder strip 22 is fitted in an elongated recess in the side wall 2|0f the vat and suitably secured thereto, thus forming a ledge on theinner face of same. This support frame 22 provides a means of supportingthe screen plate 23; the latter resting on the upper edge of same.

The side wall 2! has a plurality of cutouts or apertures 25 in samewhich are suitably spaced so as to coincide with the fasteningdevices 24which are mounted at intervals in the longitudinal strip 20. A lookplate 26 is mounted over each of the apertures 25 in the side wall 2|and fixedly secured thereto. The lock plate 26 is accommodated in arecessed portion around the aperture 25,thus permitting the outer face26A ofsame to be flush with theinner face of the side wall 2|. Thislockplate has an aperture or cutout 21 which may be square or rectangular inshape with inwardly protruding edges 28 on three sides thereof. Theremaining edge 29 of the aperture 21 has only sufiicient thickness forstrength and the tapered or wedg shaped portion 30 extends upward andtherefrom. This tapered portion is formed actually by increasing thethickness of that portion of the lock plate as it recedes from theaperture 21. The tapered portion 30 is in a parallel inclined plane withrespect to the outer face 26A of the lock plate 26, thus providing asurface with which'the locking head 3| may engage.

The locking head 3| forms a part of the locking device 24 and isslidably accommodated in same. The main portion 32 of the locking head3| has an internally threadedportion 33 extending verticallytherethrough. This main portion 32 of the locking head has a pair offlanges or lugs 34 protruding therefrom. These flanges 34 form anintegralpart of the main portion 32 and extend vertically the entirelength of same. The lower portion 35 of the locking head 3| extendsoutward horizontally a predetermined distance from the main portion 32of same, and then extends vertically upward therefrom to form a. catch,or lip portion 36. The inner face 31 of this lip portion 36 extendsoutward and upward from the lower portion 35 of the locking head, thusframe:223

7 providing a tapered lip which engages with the ing an elongated slot42 in the vertical portion 43 of same. The recessed portion .39 inthestrip member 20 in cooperation with the vertical por-- tion 43 of theguide member 4| form a vertical passage having a which the locking head3| is slidably fitted. The flanges 34 of the locking head travel in'thispair of grooves, thus maintaining same substantially in position as itslides upward and downward with respect to the strip member 20. The lipportion 36 ofthe' locking head. 3| projects through the slot 42 =in-theguidemember 4| thus beingin position for engagement-with the taperedportiontfi of the lock plate 26..

"The horizontal portion 44:of the guide member 41 rests on the upperedge of'the strip member 29 and hasa-hole 45 in'same. V The adjustingbolt 46 consists of: a threaded portion 41 which has a shoulderportion48 formed toward the upper part of same. The upper 'end of theadjustingbolt- 46 has a square head 49 which is smaller: than theshoulder portion48 The threaded portionj'l of: the adjust! ing bolt- 46extends through the hole '45 in the guide member 4| and engages thethreaded portion 33 in the-locking head-3|. Asthe'adjusting bolt46=:is:threaded. into the locking head 3| the'shoulder portion 48 bears'on the upper surface of the guide member 4| thus raising the locking'head. While-in this in:- stance the'adjustihg screw-:has a square headit could be provided with a hexagon or type of head adaptable to beturned'by-a-keywithout generally affecting the advantages of theinvention. The side wall'of the vat has a-recessed portion 52 whichextends above the top-level of theiaddusting bolt 46, therecesstp'roviding' necessary space for the application of a key 'orother suitaible implement to the-bolt.-

The strip member 2'li'has a recessed portion 50 along the lower edge ofsame, which accomrnodate the packing strip 'whichis slidablysecuredtherein. Thispacking strip-extends: the

*entire length of the strip member 20 and. protrudes pastthe innerface40 of same. The packing strip 5| also extends downward asuitabledistance below the lower edge of. this strip member.

In the operatiomof the. invention the; screen plate 23 is placed inposition on the: support The stripnmember 29 which accom-"modatesaplurality of locking-"devices :24 and the packing'cstrip 5|is-then-placed-in'position along -the"upper ,edge of the screen plateadjacent to itherside Wall 2'|-'of the:vat.' Theiadjustingbolts -45:-areloosened sufficiently-to allow the lip porjtiOn' 36 of: the cking.head-3| in each of the flocking devices-24 tobe insertedin the aperture21 of the lock plates 26. The adjusting bolts 46 are'then tightenedraising each of the locking heads 3|- so that. their respective lipportions 36 engage with the tapered portion 30 of each of thelock-plates 26. -As the inner face Slofthese lip portions 36-are taperedto coincide with the tapered portion 30 of the lock plates 26 thewedging pair of grooves'therein andini action forces the packing strip5| tightly against the side wall 2| of the vat and the upper edge of thescreen plate 23 simultaneously.

' It will be seen from the foregoing that a sealing strip has beendesigned that will provide a leak-proof means of securing screen platessubstantially in position and at the same time render the latter easilyremovable for replacement, cleaning and the like.

What I claim is:

In a sealing strip for pulp and other types of screen plates;v a unitadapted to hold a screen plate in position on a ledge secured along theta'chableto the wall of the vat and comprising a longitudinal memberhaving a recess extending along the bottom. face at the inner edgethereof and apacking strip located in the recess and projecting beyondthe bottom face and the inner edge of the member, thereb providing thesame with two'working surfaces, andsaid-pa'cking'strip being brought'indirect contact with the top of the screenplate along its inner edge aspositioncd on the supporting ledge, effectively sealing the same withrespect to the top surface of the screen and with the-inner wall of thevat, locking means for maintaining said unit to the" wall of the vatoverthe screen plate and an adjusting means on the longitudinal member ofsa'id'unit adapted to be manipulated and co-act withthe locking meansfor moving said unit slightly downward and inward to position saidpacking strip to the screen plate and against the wall of the vat, thesaid lockingmeans comprising a lock plate mounted on thewall'of the vatover an aperture therein, the lock plate having cutout therein threeside edges of which protrude inwardly, a tapering or wedge-shapedportion being formed" on the other side of the cutout and extendingupwardly, a locking head'slidably located in a recess formed'in the rearface of said longi tudinal member of said unit and having a ver ticalthreaded'portion andan outwardly extending and upwardly formed'lipportion adapted to engage the said'tapered' edge" of the cutout in saidlock plate upon the said unit being positioned to the wall of the vat,said adjusting means consisting of a threadedbolt extending down intothe recessin said longitudinal member and engaging the threadedportion-of said HENRY WILLIAM. DOWNS, JR.

REFERENCES CITED The following references-are-of record in the hit: ofthis patent:

Downs Feb. 4, 1941

